Malicious PDF — malware analysis report

Static analysis result for SHA-256 43aec58d1c88c3ad…

MALICIOUS

PDF

47.1 KB Created: 2021-05-11 01:04:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0128aae777670fdb6e2f0ce9fa434ff7 SHA-1: 33eb274317dee1f347766bc5f30733a9d68a7307 SHA-256: 43aec58d1c88c3ad6059dd719a130ea6c10537a5bb2ce0e83747eb7d94c571d9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites that promise game hacks and free currency, a common lure for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract traffic. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/406889139/coin-master-free-coins-and-spins-daily-game-hack PDF link annotation
    • https://diendientuvn.com/public/upload/files/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-spins-coin-master-2021-app_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-spin-hack-link_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/roblox-top_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d2e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D2E 26396 bytes
SHA-256: 3942f3f8fa5a17a211203535422d4053f8d55c1ba7ae4a3e2ddcc32824ad3444
font_01_sfnt_off000089d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89D7 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00009500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9500 18480 bytes
SHA-256: afe33923ca989cd5d8a4fb240de59bbfcccaf1928071fdd0e6e63d3de042dc3b

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